Claude Sonnet 5.5 vs Claude Fable 5.1
Claude Sonnet 5.5 took 3 min 49 s and $0.34 at list price, Claude Fable 5.1 took 16 min 4 s and $3.97 at list price. Claude Fable 5.1 took 4.2× as long and cost 12× as much.
Claude Sonnet 5.5
Anthropic · $10.00/M out · 9 HN pts
Claude Fable 5.1
Anthropic · $50.00/M out · 1,630 HN pts
Pelican
Generate an SVG of a pelican riding a bicycle
Watch
Draw a mechanical wristwatch that shows the current local time, with a sweeping seconds hand and a date window. Make it look expensive.
Landing
Build the landing page for Lumen Cycles, a Copenhagen workshop that builds custom cargo bikes to order. Make it look like a real brand you would trust with 4,000 euros.
Breakout
Make a Breakout game I can play right now with the keyboard or the mouse. Give it several levels, a score and some juice.
Logo
Design a logo for Night Heron, an independent bookshop that only opens after dark.
About
Write the opening of the About us page for Patchbay, a three-person studio in Rotterdam that repairs vintage synthesizers. About 150 words.
Patchbay is three people in a workshop in Rotterdam, trying to keep old synthesizers alive. We repair, restore and recalibrate the instruments that shaped electronic music: Moogs and Oberheims, Rolands and Sequential Circuits, the odd temperamental Soviet oddity that someone found in an attic.
Most of what lands on our benches has been silent for years. A crackling pot, a drifting oscillator, a power supply that gave up in 1994. Some come from working musicians who need their instrument back before the next tour. Others come from people who inherited a dusty box from a parent and want to hear what it sounds like.
We work slowly and by hand. We trace faults with a scope and a schematic, source or rebuild parts when originals are gone, and change as little as we can. Every synth leaves with a note describing exactly what we did, so the next person to open it knows where we have been.
Come by, bring your synth, and stay for coffee.
Patchbay is three people and one workshop in Rotterdam, and we spend our days bringing old synthesizers back to life. Most of what arrives at our bench is somewhere between thirty and fifty years old: a Juno with a dead voice chip, a Minimoog that drifts out of tune the moment the room warms up, a Polysix whose battery has quietly eaten its own circuit board. We know these instruments inside and out because we have had hundreds of them open on the table.
We started Patchbay because we kept meeting musicians who had been told their synth was not worth fixing. We disagree. These machines were built to be serviced, and with the right parts, enough patience, and a good set of schematics, almost any of them can be made to play again. When we hand an instrument back, we want it to sound the way it did the day it left the factory, or better.
Specs and numbers
| Claude Sonnet 5.5 | Claude Fable 5.1 | |
|---|---|---|
| Maker | Anthropic | Anthropic |
| Made in | US | US |
| Released | 28 Sep 2026 | 1 Sep 2026 |
| Price in, per M tokens | $2.00 | $10.00 |
| Price out, per M tokens | $10.00 | $50.00 |
| Context | 1,000,000 tokens | 1,000,000 tokens |
| Weights | closed | closed |
| Hacker News points | 9 | 1,630 |
| Time for the six prompts | 3 min 49 s | 16 min 4 s |
| List price of the six prompts | $0.34 | $3.97 |
Claude Sonnet 5.5 was cheaper: $3.63 less at list price, and less on each of the 6 prompts. Claude Sonnet 5.5 was faster: 12 min 16 s less in total, and faster on each of the 6 prompts.
In the recording, Claude Sonnet 5.5's Breakout game plays; Claude Fable 5.1's stopped painting.
Rebuild this screen experiment: Claude Sonnet 5.5's rebuild matched the screenshot at 94%, Claude Fable 5.1's 78%. Tea Garden experiment: Claude Sonnet 5.5's game passed 5 of 5 checks, Claude Fable 5.1's 5 of 5.





